TWM492373U - Intelligent constant pressure inverting pump system without pressure boosting bucket - Google Patents

Description

Intelligent constant pressure variable frequency pumping system without booster barrel

This creation is about a constant pressure variable frequency pump, and in particular, it relates to a smart constant pressure variable frequency pumping system without a supercharger.

The pumping system is used to transport fluids such as water. It is a must in today's society and is widely used in building general households and industrial plants. It is one of the important water supply facilities. The traditional water supply facilities adopt the following methods: a pressure switch, a booster cylinder and a motor-driven pump are installed on the pipeline. When a load is generated, the pipeline is first supplied by the booster cylinder, and then the pressure drops to touch the pressure. The switch, which in turn starts the pump, drives the water into the booster cylinder and the load at a constant speed. When the load disappears, the pressure of the pipeline rises, causing the pressure switch to shift and stop pumping. Since the supercharged cylinder contains a certain amount of water with a certain pressure, when the load is less than the volume of the supercharged cylinder, although the constant pressure cannot be achieved, the stable operation can be achieved. However, if the load changes frequently or the load is greater than the volume of the booster cylinder, the pipeline pressure will be unstable and the stoppage will frequently reduce the service life, which is the biggest missing. In order to overcome this deficiency, a component with the ability to change the pressure of the pipeline is generally installed on the water supply pipeline, such as the device disclosed in Announcement No. 550343 published in the 2003/09/01, or the pressure switch is replaced by a pressure check. Knowing the device, another frequency converter receives the pressure signal from the pressure detector, according to the modulation of the speed of the connected pump, because the frequency converter can make detailed speed control, it can change the pump speed with the load change. To achieve constant pressure, as disclosed in Announcement No. 296005 of the Announcement of 1997/01/11 Pressure conversion pump. However, all of the above methods still have the following improvement space:

1. In the large-load water supply occasion, a larger pump and a larger volume of the booster cylinder must be used, thus increasing the vibration and noise generation, and the space requirement, which limits the installation location and space. The choice, especially in the trend of increasing the cost of building space in today's cities, is even more obvious.

2. In some applications, such as hotel motel stations, the load has obvious peak and off-peak performance, and the load difference between the two peaks corresponding to the peak is quite large. In this case, high-power pump and large volume must be used. Supercharged cylinder for demand during peak hours. However, any small load during the off-peak period will also activate the high-power pump, which produces another form of frequent stop, which is not in line with the principle of energy conservation and is not conducive to the service life of the pump.

3. Since the water supply line is a closed circuit, the system will be stable under any pressure balance (line pressure is equal to the set pressure), even if there is no load and the pump speed is not zero, which means In the water supply circuit controlled by constant voltage variable frequency mode, the load is zero but the pump does not stop (running at a lower speed) is also a kind of steady state, plus the length and layout of the field pipeline are different, the pressure detector Instantaneous noise interference, the impedance characteristics of the load valve, and the user's water habits are subject to change at any time. These factors tend to make the system less likely to fall into the non-stop. It is necessary to fine-tune its system parameters frequently at each site, otherwise the lighter wastes the energy of the motor and overheats the pump blades to wear distortion.

The present invention provides a smart constant pressure variable frequency pumping system without a booster cylinder, which can be installed in a water supply pipeline without a booster cylinder by a central control unit and controlled by a constant voltage frequency conversion method. The signal transmitted by the pressure detector on the pipeline controls a single unit The speed of the pump group in which the pumps are operated in parallel satisfies all load requirements while maintaining constant pressure.

Because the water supply pipeline is a closed loop, when a load is generated, the pump outlet will take away heat due to fluid movement, so the temperature at this location must be less than or equal to the fluid temperature. If the pipeline is unloaded, it is unknown. For the reason that the pump is stable at a non-zero rotational speed, as in the third missing phenomenon described in the prior art, the pump outlet will generate heat due to the heat generated by the rotation of the pump blade without moving the fluid away. Rise. The present invention utilizes this feature to detect the temperature rise at a first time by a temperature sensor installed near the pump outlet, thereby turning off the pump, which can effectively improve the third method as described in the prior art. Missing item.

On the other hand, the present invention provides an intelligent non-pressurized constant pressure variable frequency pumping system operation method, which can maintain the tube according to the pipeline load demand in a pump group formed by a plurality of single pumps connected in parallel. The road pressure is balanced according to the set value, automatically starts or shuts down at least one of the pumps, and adjusts the rotation speed of the at least one pump group according to the pressure change on the pipeline to balance the pipeline pressure to the set value. In this way, when the peak is off, the system will run with a single pump frequency conversion. When the peak is peaked, the multiple pumps will be operated in parallel with variable frequency. How many load demands will start the pump with the proper number of parts and run at the appropriate speed, which is both efficient and economical. The energy principle effectively improves the second missing as described in the prior art.

In addition, the pressure drop in the pipeline represents the load generation. The high-speed processing capability of the analog-to-digital conversion module and the processor (CPU) included in the central control unit can be confirmed at the beginning of the pipeline pressure drop. The way in which the downward trend is established is that the load demand is generated at the first time, and at the same time, the pump is operated at a speed proportional to the pressure drop rate of the pipeline, so that the pressure is still stable at the time of the load generation. Since the pressure is stable, it means that there is no need for a booster cylinder in the water supply line.

The above is the lack of the description of the prior art, the proposed technical means and the effect achieved. In order to make the above features and advantages of the present invention more apparent, the following is a preferred embodiment according to the present invention.

100‧‧‧Central Control Unit

110‧‧‧Keys and LED display module

120‧‧‧Processor CPU

130‧‧‧Command output interface

140‧‧‧ analog to digital conversion module

PS‧‧‧Pressure detector

TS_1‧‧‧Temperature Sensor_1

TS_N‧‧‧Temperature Sensor_N

INV_1‧‧‧Inverter Control Command_1

INV_N‧‧‧Inverter Control Command_N

U/V/W‧‧‧Three-phase AC control signal

1 is a block diagram of a constant pressure variable frequency pumping system of a smart type unsupercharged cylinder according to an embodiment of the present invention.

Figure 2 is a flow chart of an instant event handler.

Figure 3~5 is a flow chart of the main program.

Figure 6 is a flow chart of the pumping subroutine.

Figure 7 is a flow chart of the pump exit subroutine.

1 is a block diagram of a constant pressure variable frequency pumping system of a smart type unsupercharged cylinder according to an embodiment of the present invention. As shown in FIG. 1, a central control unit 100, a pressure detector PS, at least one to a plurality of temperature sensors TS_1...TS_N (N is a positive integer greater than 1), and an electric pump group are included. . The central control unit 100 includes a button and LED display module 110, a high speed processor (CPU) 120, an instruction output interface 130 capable of outputting at least one to a plurality of control signals, such as INV_1...INV_N, and an ADC_1 An analog digital conversion module 140 of at least two to a plurality of conversion channels, such as ADC_N.

The electric pumping group is controlled by a frequency converter (INVERTER) with a three-phase alternating current (U/V/W) to control a motor-driven pump (PUMP) for at least one group to a complex array, and the pumping The vent hole has a temperature sensor (TS) fixed by screws to the vent hole Electric pumping group. The inlet and outlet of the complex array pump (PUMP_1...PUMP_N) are respectively connected in parallel by a pipeline (PIPE) to form a separate inlet and outlet, and on the outlet and its extension pipeline (PIPE), no pressurization The cartridge or other device similar in function, only the pressure detector PS is installed together with the plurality of temperature sensors TS_1...TS_N respectively connected to the analog digital conversion module 140 of the central control unit 100, and a plurality of The input terminals of the frequency converter are respectively connected to the output signals INV_1...INV_N in the command output interface 130 of the central control unit 100.

The buttons in the central control unit 100 and the LEDs in the LED display module 110 can be one or more seven segments, single or dual color LEDs, RGB three color LEDs, or any combination thereof. The button and LED display module 110 is coupled to a high speed processor (CPU) 120 to form an effective human interface for the user to update settings or input parameters and system status displays. The high speed processor (CPU) 120 is also connected to the command output interface 130 and the analog digital conversion module 140 to collect and process the pipeline pressure signal transmitted by the pressure detector PS in the form of 0~10V voltage or 4~20mA current. After the PID program is calculated, the rotational speed of the electric pump group 200 is controlled through the command output interface 130 to form an effective constant voltage frequency conversion control loop. All of the operating methods in this embodiment are implemented by executing a set of programs stored in the embedded memory including at least the following programs.

Figure 2~7 is a flow chart of the operation of a smart type non-pressurized constant pressure variable frequency pumping system, including a main program (Fig. 3~5), an instant event processing program executed periodically (Fig. 2). And a subroutine set including at least the following subroutine: there is a PID control subroutine, which dynamically adjusts the pump logic logic stored in the CPU memory by the frequency converter according to the pressure change and the load demand on the pipeline. The active pumping speed of the composition defined in the table is maintained to maintain the line pressure balance at the set value, and Specify another stationary pump as the slave pump.

The active pump, slave pump and the actual complex pump group (Pump1...PumpN N>=1) have the following relationship:

1. The active pump is any combination of non-zero in the complex pump group (Pump1...PumpN N>=1), such as Pump1 or (Pump1+Pump2) or (Pump2+Pump4+Pump5)....etc. .

2. If the active pump is more than one of the plurality of pumps, the plurality of pumps are controlled in parallel by the PID control program and operate at the same speed.

3. In the actual complex pump group (Pump1...PumpN N>=1), the first pump in the remaining list that does not contain the active pump is the slave pump.

4. If the active pump is the actual complex pump group, the slave pump is zero.

5. The above relationship is recorded in a pump logic physical table stored in the memory of the CPU memory.

There is a pump incorporated into the subroutine (Fig. 6), which is executed when the load demand in the water supply line increases, the active pump has reached full speed, and the pressure in the line still cannot be balanced to the set value. Step: First check whether the parallel flag is set. If it outputs a preset value to the slave pump and its register, set the parallel flag and return. If yes, first determine whether the pipeline pressure is stable, and if not, return; if yes, determine whether the difference between the active pump and the slave pump is reduced to a threshold, otherwise the slave pump and its register are The value is equal to the original value plus a preset value and returned. If so, the active pump is placed in parallel with the original active pump and the slave pump, and the next idle pump is re-designated as the slave pump, and the logical and physical reference tables of the pump are updated to form the active pump and the slave pump. , then clear the side-by-side flag and return.

There is a pump exit subroutine (Figure 7) that will be required for load in the water supply line To reduce, the active pump speed is reduced to a threshold (such as a certain percentage of full speed) is executed, the program performs the following steps: first check whether the exit flag is set, otherwise it will be at least the logical physics table of the pump The last pump corresponding to the two parts is designated as the slave pump, and the remaining corresponding combination is designated as the active pump, then the logical physics table of the pump is updated, and the flag is set to exit and return. If yes, first determine whether the pipeline pressure is stable, and if not, return; if so, determine whether the output value of the slave pump is less than a threshold value? If otherwise, the value of the slave pump and its register is equal to the original value minus one preset value and then returned. If so, the value of the slave pump and its register is equal to zero, and the exit flag is cleared and returned.

The instant event handler shown in Figure 2 will execute every 2.5 milliseconds. The program first updates the LED display and checks if there is a key input, and if so, the record is used by the main program to process the human interface. Then perform the following steps for all the pumps: first check whether the superheat flag of the pump is set, and if so, stop the pump, otherwise, according to the corresponding relationship in the logical physics table of the pump, the pump is pumped. The output value is equal to the calculated value of the active or slave pump in the PID program. Repeat this step until the last pump. Since the program is fixed every 2.5 milliseconds, the rate of change of the physical quantity can be easily calculated by successively reading the value of a certain physical quantity. In this way, the program then calculates the rate of change of the pipeline pressure and actively The rate of change of the speed of the slave pump and the pump is incorporated into the subroutine and the pump exit subroutine. Finally update the alternate countdown timer and other system timers.

Figure 3~5 is a flow chart of the main program. As shown in Fig. 3, the program first executes a system starting step including hardware and software, and then enters a loop of a loop execution, and the loop repeats the following steps:

1. Determine if there is a key input, if any, according to the button recorded by the instant event handler Data, enter manual mode or system query or parameter setting and maintenance mode to form an effective human-machine interface operation. At this time, the program will repeatedly process the key input and display the system information or response data in the LED display unit through the instant event processing program. Until the end of the key input. In this way, the user can arbitrarily change the speed of any pump in the manual mode, or query the system information in the system query mode, or in the parameter setting and maintenance mode, the user can change some system settings or such as PID parameters. System parameters.

2. Collecting the data transmitted by the temperature sensors TS_1 to TS_N through the second to N+1 conversion channels in the analog to digital conversion module and filtering them for recording.

3. Determine the temperature of each pump whose speed is not zero. If it exceeds the temperature threshold, set the pump's overheat flag. If it is lower than the start threshold, clear the pump's overheat flag. The flag, the instant event handler, immediately shuts down the pump until the heat is removed, so that the protection function can be achieved.

4. Through the first conversion channel in the analog to digital conversion module, collect the pipeline pressure data transmitted by the pressure detector PS in the form of 0~10V voltage or 4~20mA current and filter and process the data.

5. Calculate the error value of the line pressure and the set pressure, and call the PID control subroutine with this value, and put the return value (ie the speed of the active pump) into the register for the instant event handler according to the pump. The corresponding relationship in the logical physics table of Pu, and the overheating flag of the pump, shut down or start the pump.

6. Check if the side-by-side flag is set, if yes then call the pump into the subroutine and skip to step 8. If not, check if the exit flag is set, if yes, call the pump to exit the subroutine, then skip to step 8.

7. Check that the line pressure change rate is lower than a threshold value within a reference time. If not, skip to step 8. The pressure change rate is lower than a threshold, which means that the pipeline pressure has reached a relatively stable state. If yes, it is judged whether the active pump output is fully loaded or greater than a threshold and the pressure error value is greater than zero. If yes, the call pump is merged into the subroutine, and then jumps to step 8. If it is not determined whether the active pumping speed is lower than a threshold, if yes, call the pump to exit the subroutine, and then skip to step 8.

8. Determine if all pumps are in the shutdown state, otherwise jump back to step 1. If yes, check if the alternate countdown timer updated by the instant event handler is zero, otherwise jump back to step 1. If yes, the pump specified by the appointment designation or operation is set as the active pump, and the logical physics comparison table of the pump is updated, and then the process returns to step 1. If the pump is actively pumped in the plural pump at regular intervals, the working hours of each pump can be averaged to extend the life of the system.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any person having ordinary knowledge in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of protection of this creation is subject to the definition of the scope of the patent application attached.

100‧‧‧Central Control Unit

110‧‧‧Keys and LED display module

120‧‧‧Processor CPU

130‧‧‧Command output interface

140‧‧‧ analog to digital conversion module

PS‧‧‧Pressure detector

TS_1‧‧‧Temperature Sensor_1

TS_N‧‧‧Temperature Sensor_N

INV_1‧‧‧Inverter Control Command_1

INV_N‧‧‧Inverter Control Command_N

U/V/W‧‧‧Three-phase AC control signal

Claims (4)

A smart constant pressure variable frequency pumping system without a pressurized barrel, comprising a central control unit, and a multi-inverting array controlled by a frequency converter (INVERTER) with a three-phase alternating current pump driven by a motor, and the pump The vent hole of the Pu has a pump group composed of a temperature sensor fixed to the vent hole by screws, and the inlet and the outlet of the complex array pump are respectively connected in a pipeline (PIPE) to form a separate group. The inlet and outlet, and on the outlet and its extension pipe (PIPE), are only equipped with a pressure detector, a non-pressurized barrel or other device similar to its function, wherein the central control unit is The memory program is automatically incorporated or exited in the complex array pump according to the load demand on the pipeline. Under the condition of maintaining constant pressure and energy saving, the pump is operated at an appropriate speed with an appropriate amount of pump. The intelligent non-pressurized constant pressure variable frequency pumping system as described in claim 1, wherein the central control unit comprises: a processor (CPU) available digital signal processor (DSP) or a single chip or system The chip is realized; a button and an LED display module are connected to the processor (CPU) to form an effective human machine interface; an analog to digital conversion module connected to the processor (CPU), and another processor (CPU) Connected instruction output interface. For example, the intelligent non-pressurized constant pressure variable frequency pumping system described in claim 2 of the patent application, analogous to the digital conversion module, with its first analog to digital conversion channel (ADC_1), receiving pressure detection The voltage data transmitted by the device (PS) in the form of 0~10V voltage or 4~20mA current, and its second to N+1 analogy to the digital conversion channel (ADC_2)...(ADC_N+1), receiving at least one to Temperature data of a plurality of temperature sensors (TS_1)... (TS_N), which may be negative temperature coefficient thermistors or other types of temperature detectors. A smart type non-pressurized barrel constant pressure variable frequency pumping system as described in claim 2, The instruction output interface of the instruction is at least one to a plurality of inverter control commands_1 (INV_1) outputted to a voltage of 0 to 10 V to the inverter control command _N (INV_N), or a communication interface realized by RS422 or RS485.